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Computer Scientist Hobbies Sailing in a Dutch Traditional Vollenhovense Bol 8 50 m Unix Linux Open Source Programming in Python and Sage Sage is a free open source mathematics software system Solving Mathematical Problems OEIS The On Line Encyclopedia of Integer Sequences Astronomy Many more Links My visit to Saint Petersburg Dutch Sage Days 6 in Bristol See my pictures Sailing at the 5ECM Sage Days 10 in Nancy Some

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and 6 in 2006 And of August 2006 there is my third granddaughter On the 9th of July 2008 my fourth granddaughter was born Lovely to see them growing up I could have mentioned them under my Hobbies Starting in 2002 maybe earlier I had some health troubles My doctors among others my youngest son who was the first to think in the right direction found after a year with all kind of tests and examinations that I was suffering of late Lyme s disease Acrodermatitis chronica atrophicans in my left leg neuroborreliosis and some other minor problems I feel better now Having a Masters Degree in Mathematics and the Foundation of Mathematics I could have called myself mathematician I did not until lately In a discussion in the newsgroup sci math I found a definition A person is a mathematician if he is called so by an other mathematician Thank you Hans en Robbert I was a teacher in Math and Computer Science in various settings For a couple of years now I am enjoying solving problems for instance from the Nieuw Archief van de Wiskunde NAW a Dutch Math journal Jaap is pronounced in Dutch as ya from

Original URL path: http://www.jaapspies.nl/personal.html (2015-08-10)

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Professional A short history My professional career If I have time this story eventually will be written

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Sailing A long time hobby Coming soon My ship More soon My Sailing Waters pictures

Original URL path: http://www.jaapspies.nl/sailing.html (2015-08-10)

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is not true I witnessed in 1976 the installation of UNIX version 6 at the OW OC later called the Freudental Institute of the University of Utrecht My own UNIX machines My first Unix computer was an ONYX C8002 with

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Programming Long ago C C Python

Original URL path: http://www.jaapspies.nl/programming.html (2015-08-10)

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How to match boys and girls in a dancing class under certain length restrictions My story of the Dancing Schools includes the solution of Problem 29 but also links with certain kinds of Rook Placing Problems There is a SAGE program to generate polynomial solution to a certain class of problems From the Dancing School Problem originated the sequences A079908 A079928 from the OEIS see below My solution of problem 29 is in terms of the permanent of 0 1 matrices So I became interested in Permanents Playing with Maple and counting I found an alternative for the famous Ryser s algorithm I implemented my algorithm in a C C program which was used to contribute to Neil Sloane s On line Encyclopedia of Integer Sequences OEIS See for instance A087982 A088672 and A089476 The dancing school returned in a problem published at Elsevier s www mathematicsweb org thislink was in abuse as problem 3 yet unsolved The link to Elsevier s Problem Section seems to be dead Problem 29 once again showed up in disguise as part 2 of Problem2006 2B see below in the NAW 5 7 nr 2 There were no solutions sent in so this is a waste of a nice problem There is an article in the NAW 5 7 nr 4 December 2006 Dancing School problems Permanent solutions of Problem 29 A preprint can be found here UWC Problems The problem section of the NAW was discontinued and merged with the UWC the University Math Competition open for Belgian and Dutch math students Starting with NAW 5 4 nr 1 the Problem Section and the UWC became the section Problemen UWC First in Dutch but later on my suggestion the problems are formulated in the English language as are the solutions Students can gather

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age So without telling him my father became member of the NVWS Soon more Astronomy at the University of Utrecht As a student in Math Physics and Astronomy I was in 1961 lucky to have the opportunity to attent the last two years of lecturing of the late professor Marcel Minnaert Most famous for his Natuurkunde van t vrije veld partially published as The Nature of Light and Colour in

Original URL path: http://www.jaapspies.nl/astronomy.html (2015-08-10)

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